Milestone moment toward development of nuclear clock https://www.sciencedaily.com/releases/2023/11/231103141443.htm
Summary:
Physicists have started the countdown on developing a new generation of timepieces capable of shattering records by providing accuracy of up to one second in 300 billion years, or about 22 times the age of the universe.
About
scandium-45 and ultra-bright X-ray pulses
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Subject: Re: Milestone moment toward development of nuclear clock
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Subject: Milestone moment toward development of nuclear clock
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Milestone moment toward development of nuclear clock
https://www.sciencedaily.com/releases/2023/11/231103141443.htm
Summary:
Physicists have started the countdown on developing a new generation of timepieces capable of shattering records by providing accuracy of up to one second in 300 billion years, or about 22 times the age of the universe.
About
scandium-45 and ultra-bright X-ray pulses
On Tue, 07 Nov 2023 05:16:24 GMT, Jan Panteltje <al...@comet.invalid>
wrote:
Milestone moment toward development of nuclear clock
https://www.sciencedaily.com/releases/2023/11/231103141443.htm
Summary:
Physicists have started the countdown on developing a new generation of timepieces capable of shattering records by providing accuracy of up to one second in 300 billion years, or about 22 times the age of the universe.
AboutHow does one phase-lock to a gamma ray absorption line?
scandium-45 and ultra-bright X-ray pulses
And even caesium clocks change frequency with altitude because of
gravity and relativity effects... a few feet matter! Gravitational
noise will trash a super-good clock. [1]
I worked on a Mössbauer experiment once. Gamma absorption lines are so narrow that slow velocity changes - mm per second- affect absorption.
https://en.wikipedia.org/wiki/M%C3%B6ssbauer_effect
[1] a better gravity detector than LIGO?
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From: john larkin <jl@650pot.com>
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Subject: Re: Milestone moment toward development of nuclear clock
Date: Tue, 07 Nov 2023 15:37:14 -0800
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Subject: Re: Milestone moment toward development of nuclear clock
From: Anthony William Sloman <bill.sloman@ieee.org>
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On Tue, 07 Nov 2023 05:16:24 GMT, Jan Panteltje <alien@comet.invalid>
wrote:
Milestone moment toward development of nuclear clock
https://www.sciencedaily.com/releases/2023/11/231103141443.htm
Summary:
Physicists have started the countdown on developing a new generation of timepieces capable of shattering records by
providing accuracy of up to one second in 300 billion years, or about 22 times the age of the universe.
About
scandium-45 and ultra-bright X-ray pulses
How does one phase-lock to a gamma ray absorption line?
And even caesium clocks change frequency with altitude because of
gravity and relativity effects... a few feet matter! Gravitational
noise will trash a super-good clock. [1]
I worked on a Mössbauer experiment once. Gamma absorption lines are so
narrow that slow velocity changes - mm per second- affect absorption.
https://en.wikipedia.org/wiki/M%C3%B6ssbauer_effect
[1] a better gravity detector than LIGO?
On a sunny day (Tue, 07 Nov 2023 15:37:14 -0800) it happened john larkin <j...@650pot.com> wrote in <quflki1oa5h242obg...@4ax.com>:
On Tue, 07 Nov 2023 05:16:24 GMT, Jan Panteltje <al...@comet.invalid> >wrote:
Milestone moment toward development of nuclear clock
https://www.sciencedaily.com/releases/2023/11/231103141443.htm
Summary:
Physicists have started the countdown on developing a new generation of timepieces capable of shattering records by
providing accuracy of up to one second in 300 billion years, or about 22 times the age of the universe.
About
scandium-45 and ultra-bright X-ray pulses
How does one phase-lock to a gamma ray absorption line?
And even caesium clocks change frequency with altitude because of
gravity and relativity effects... a few feet matter! Gravitational
noise will trash a super-good clock. [1]
I worked on a Mössbauer experiment once. Gamma absorption lines are so >narrow that slow velocity changes - mm per second- affect absorption.
https://en.wikipedia.org/wiki/M%C3%B6ssbauer_effect
[1] a better gravity detector than LIGO?
Perhaps it could be
Ligo looks for signals with really low amplitude...
I still have an old alarm clock that you need to wind up every day...
If gravity changes a lot it may float away :-)
I do have a 10 MHz Rubidium reference.
And a desktop clock and a Casio watch that automatically syncs to DCF77 radio time:
https://en.m.wikipedia.org/wiki/DCF77
there are other worldwide stations like that, you can select a place in the watch's menu.
Gravity waves, of course you should be able to detect gravity changes caused by remote masses.
Moon-tides an example, nothing mysterious about that.
One second in 300 billion years, earth will not exist that long.
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From: Jan Panteltje <alien@comet.invalid>
Newsgroups: sci.electronics.design
Subject: Re: Milestone moment toward development of nuclear clock
Date: Wed, 08 Nov 2023 06:04:59 GMT
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